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c in (-oo:+oo)
((8*c)/3)*c-2 = ((2*c)/3)*c-12 // - ((2*c)/3)*c-12
((8*c)/3)*c-(((2*c)/3)*c)-2+12 = 0
((8*c)/3)*c+(-2/3)*c^2-2+12 = 0
2*c^2 = -10 // : 2
c^2 = -5
c belongs to the empty set
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